Syringe
First Claim
1. A syringe comprising:
- a tubular body which is provided, at its front end portion, with a portion for mounting an injection needle thereon and opens at its rear end portion so as to have a rear end opening;
a gasket for sealing the rear end opening of the tubular body, which is slidably inserted into the tubular body; and
a plunger rod which is detachably coupled with a rear end portion of the gasket through the rear end opening of the tubular body;
wherein said plunger comprises a rod portion having a front end, a small-diameter rod portion extending forwardly from said front end of said rod portion along an axis of said rod portion, said small-diameter rod portion having a diameter smaller than the diameter of said rod portion, and a pair of opposite engagement projections that extend radially outward at a front end portion of said small-diameter rod portion, whereby an elongate front end portion of said plunger rod is defined by said front end portion of said small-diameter rod portion and said engagement projections;
wherein said gasket is slidably inserted into and seals said rear end opening of said tubular body, said gasket having a rear end portion that is capable of having said plunger rod detachably coupled therewith, said rear end portion having a circular hollow therein for receiving said elongated front end portion of said plunger rod, said circular hollow having a mouth having a periphery from which a pair of opposed flanges project inward and have a central through hole therebetween for receiving said front end portion of said small-diameter rod portion therethrough and a pair of opposite recesses for receiving said engagement projections therethrough, whereby said central through hole and said pair of opposite recesses define an elongate rear end opening for receiving said front end portion of said plunger rod; and
a rotational stopping means for stopping rotation of said plunger rod in said gasket;
wherein when said plunger rod is rotated in said gasket to a predetermined position established by said rotational stopping means after said front end portion of said plunger rod has been inserted into said circular hollow through said elongate rear end opening of said gasket, said flanges can retain said engagement projections in said circular hollow.
3 Assignments
0 Petitions
Accused Products
Abstract
A syringe has a tubular body provided at its front end portion with a portion for mounting an injection needle thereon and opens at its rear end portion so as to have a rear end opening. A gasket for sealing the rear end opening of the tubular body is slidably inserted into the tubular body. A plunger rod is detachably coupled with a rear end portion of the gasket through the rear end opening of the tubular body. A male screw is formed at a front end portion of the plunger rod and is circumferentially alternately divided into at least one male screw portion and at least one first recess portion. A female screw is formed on a rear end face of the gasket and is circumferentially alternately divided into at least one female screw portion and at least one second recess portion. A state where the male screw portion and the first recess portion of the male screw are, respectively, fitted into the second recess portion and the female screw portion of the female screw, the male screw is rotated relative to the female screw so as to be brought into engagement with the female screw such that the plunger rod is coupled with the gasket.
-
Citations
23 Claims
-
1. A syringe comprising:
-
a tubular body which is provided, at its front end portion, with a portion for mounting an injection needle thereon and opens at its rear end portion so as to have a rear end opening; a gasket for sealing the rear end opening of the tubular body, which is slidably inserted into the tubular body; and a plunger rod which is detachably coupled with a rear end portion of the gasket through the rear end opening of the tubular body; wherein said plunger comprises a rod portion having a front end, a small-diameter rod portion extending forwardly from said front end of said rod portion along an axis of said rod portion, said small-diameter rod portion having a diameter smaller than the diameter of said rod portion, and a pair of opposite engagement projections that extend radially outward at a front end portion of said small-diameter rod portion, whereby an elongate front end portion of said plunger rod is defined by said front end portion of said small-diameter rod portion and said engagement projections; wherein said gasket is slidably inserted into and seals said rear end opening of said tubular body, said gasket having a rear end portion that is capable of having said plunger rod detachably coupled therewith, said rear end portion having a circular hollow therein for receiving said elongated front end portion of said plunger rod, said circular hollow having a mouth having a periphery from which a pair of opposed flanges project inward and have a central through hole therebetween for receiving said front end portion of said small-diameter rod portion therethrough and a pair of opposite recesses for receiving said engagement projections therethrough, whereby said central through hole and said pair of opposite recesses define an elongate rear end opening for receiving said front end portion of said plunger rod; and a rotational stopping means for stopping rotation of said plunger rod in said gasket; wherein when said plunger rod is rotated in said gasket to a predetermined position established by said rotational stopping means after said front end portion of said plunger rod has been inserted into said circular hollow through said elongate rear end opening of said gasket, said flanges can retain said engagement projections in said circular hollow. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A syringe comprising:
-
a tubular body having a front end portion adapted to have an injection needle mounted thereon and a rear end portion having a rear end opening; a gasket slidably inserted into and sealing said rear end opening of said tubular body, said gasket having a rear end portion; a plunger rod adapted to be detachably coupled with said rear end portion of said gasket, said plunger rod comprising a front end portion having an engagement projection member that projects radially outwardly thereof and has a predetermined angular extent; a hollow in said rear end portion of said gasket for receiving said engagement projection member of said plunger rod, said hollow having a mouth with a periphery from which a flange projects radially inwardly and a recess for receiving said engagement projection member therethrough; at least one movable sealing member disposed in said tubular body between said front end portion of said tubular body and said gasket dividing the interior of said tubular body into first and second compartments located at said front end portion and said rear end portion of said tubular body, respectively; a medicament stored in said first compartment and a liquid vehicle stored in said second compartment; a bulge portion in a side wall of said tubular body located such that when said sealing member is moved in response to movement of said gasket via said plunger rod said liquid medicament flows into said first compartment via said bulge portion; and an engaging means for temporarily stopping advance of said plunger rod into said tubular body upon movement of said plunger rod into said tubular body at a first position at which said front end portion of said plunger rod has been inserted into said circular hollow of said gasket and at a second position at which said sealing member has been moved by said plunger rod, through said gasket, to a position at which said sealing member has a portion thereof advanced forwardly of a front end of said bulge portion. - View Dependent Claims (13)
-
-
14. A syringe comprising:
-
a tubular body having a front end portion adapted to have an injection needle mounted thereon and a rear end portion having a rear end opening; a plunger rod comprising a rod portion having a front end, a small-diameter rod portion extending forwardly from said front end of said rod portion along an axis of said rod portion, said small-diameter rod portion having a diameter smaller than the diameter of said rod portion, and a pair of opposite engagement projections that extend radially outward at a front end portion of said small-diameter rod portion, whereby an elongate front end portion of said plunger rod is defined by said front end portion of said small-diameter rod portion and said engagement projections; a gasket slidably inserted into and sealing said rear end opening of said tubular body, said gasket having a rear end portion that is capable of having said plunger rod detachably coupled therewith, said rear end portion having a circular hollow therein for receiving said elongated front end portion of said plunger rod, said circular hollow having a mouth having a periphery from which a pair of opposed flanges project inward and have a central through hole therebetween for receiving said front end portion of said small-diameter rod portion therethrough and a pair of opposite recesses for receiving said engagement projections therethrough, whereby said central through hole and said pair of opposite recesses define an elongate rear end opening for receiving said front end portion of said plunger rod; and a rotational stopping means for stopping rotation of said plunger rod in said gasket; wherein when said plunger rod is rotated in said gasket to a predetermined position established by said rotational stopping means after said front end portion of said plunger rod has been inserted into said circular hollow through said elongate rear end opening of said gasket, said flanges can retain said engagement projections in said circular hollow. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
-
Specification